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https://github.com/friendica/red/wiki/zot

Zot is a JSON-based web framework for implementing secure decentralised communications and services.

It differs from many other communication protocols by building communications on top of a decentralised identity and authentication framework.

The authentication component is similar to OpenID conceptually but is insulated from DNS-based identities. Where possible remote authentication is silent and invisible. This provides a mechanism for internet scale distributed access control which is unobtrusive.

For example,

Jaquelina wishes to share photos with Roberto from her blog at "jaquelina.com.xyz", but to nobody else. Roberto maintains his own family website at "roberto.com.xyz". Zot allows Jaquelina to create an access list containing "Roberto" and allow Roberto unhindered access to the photos but without allowing Roberto's brother Marco to see the photos.

Roberto will only login once to his own website at roberto.com.xyz using his password. After this, no further passwords will be asked for. Marco may also have an account on roberto.com.xyz, but he is not allowed to see Jaquelina's photos.

Additionally, zot allows Roberto to use another site - gadfly.com.xyz, and after login to gadfly.com.xyz he can also access Jaquelina's private photos. Jaquelina does not have to do anything extra to allow this, as she has already given access rights of her private photos to Roberto - no matter what site he is logged into.

Zot also allows basic messaging and communications with anybody else on the Zot network.

In order to provide this functionality, zot creates a decentralised globally unique identifier for each node on the network. This global identifier is not linked inextricably to DNS, providing the requisite mobility. Many existing decentralised communications frameworks provide the communication aspect, but do not provide remote access control and authentication. Additionally most of these are based on 'webfinger' such that in our example, Roberto would only be recognised if he accessed Jaquelina's photos from roberto.com.xyz - but not from gadfly.com.xyz....
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